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1. Grind flat, use 320grit sandpaper for water cooling, grind for 2 ~ 3 minutes, remove the damage layer caused by cutting the titanium bar, and make the sample surface flat. Use 320grit SiC sandpaper, water-cooled, 240 RPM, co-rotation *, pressure: 27N (6lbs) per sample until the sample is flat.
Note: Removing the cutting damage layer is the basic task of sanding. If the removal is not clean, the direct consequence is that the observed phenomenon may be an artifact.
2. For rough polishing, apply 9μm metaDI diamond polishing paste on the TEXMET polishing cloth with holes in advance, and use distilled water as the cooling lubricant, and polish for 10-15 minutes. Rough polishing process: 9μm metaDI diamond polishing liquid + metaDI polishing lubricant, using ULTRA-PAD polishing surface, rotating speed 120 RPM, reverse rotation **, pressure: 27N (6lbs) / each sample, time 10min.
3. For final polishing, use MICROCLOTH or MASTERTEX polishing cloth, add MASTERMET silica suspension polishing liquid, and polish for 10-15 minutes. Final polishing process: On the MICROCLOTH polishing surface, use MASTERMET silica polishing liquid, rotating speed 120 RPM, reverse rotation, pressure: 27N (6lbs) / each sample, time 10min. Note: During the polishing process, the sample needs to be rotated in a regular direction. Most metal alloys have a hard phase. If they are not rotated, the polished sample will have a black "long tail" on the hard phase, which will affect the quality of the metallographic phase. The key to the "long tail" problem is to turn the sample. You can turn 90 or 180 degrees each time.
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Link to this article：Introduction of Gr4 titanium rod and titanium alloy bar polishing technology
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